JP5439108B2 - Secondary battery device and vehicle - Google Patents

Description

  The present invention relates to a secondary battery device and a vehicle.

  In recent years, manned vehicles and unmanned vehicles equipped with battery devices have been used. Lead-acid batteries, nickel-cadmium secondary batteries, nickel hydride secondary batteries, and lithium ion secondary batteries (LiB) are adopted for the battery devices used. This is because a vehicle equipped with a secondary battery device has no exhaust gas and is effective for environmental conservation.

  The secondary battery device includes an assembled battery module in which an assembled battery in which a plurality of batteries (cells) are connected in series and a monitoring device that monitors the state of each battery are integrated. When mounted on a vehicle as a secondary battery device, a plurality of assembled battery modules are mounted in a state of being connected in series so that a required voltage can be obtained. The reason why a plurality of assembled battery modules are used in combination is that handling is facilitated as a small module unit during battery replacement, transport work, and the like.

  There exists patent document 1 as a power supply device of a vehicle. This document discloses the entire block of the battery device, and devise measures for failure such as when the power supply line is cut off.

  As a method for equalizing non-uniform energy, a resistance discharge method (Patent Document 2) is known. In addition, as a method for determining which secondary battery to discharge, a method of detecting a voltage difference between the batteries and determining a secondary battery to be discharged based on the voltage difference (Patent Document 3), or an SOC between the batteries. A method of detecting a (State Of Charge) difference and determining a secondary battery to be discharged based on the SOC difference is known (Patent Document 4).

JP 2008-193757 A Japanese Patent Laid-Open No. 11-150877 JP 2001-218376 A JP 2003-219572 A

  This type of battery device is provided with a battery management system. The battery management system needs to appropriately grasp the deterioration state of the battery in order to replace the battery, and appropriately grasp the remaining capacity of the battery in order to perform charging.

  For this purpose, information such as cell voltage data is transmitted to the microprocessor from voltage / temperature monitoring devices in a plurality of assembled battery modules constituting the battery device. The microprocessor can process the cell voltage data from each voltage / temperature monitoring device and grasp the remaining battery capacity.

  However, cell voltage data transmitted from a plurality of voltage / temperature monitoring devices is not always correct.

  Further, the conventional apparatus is further insufficient in terms of noise countermeasures or failure countermeasures, and an improvement in the accuracy of measurement data is desired.

  In a battery device mounted on a vehicle, the measured voltage data may be affected by noise emitted from an inverter or the like that obtains a rising voltage. If the voltage data is altered by noise and shows a high remaining amount, charging is not sufficiently performed. Conversely, when the voltage data is altered by noise and indicates a low remaining amount, an overcharge state occurs.

  Accordingly, the present invention first provides a secondary battery device and a vehicle that can check whether cell voltage data transmitted from a plurality of voltage / temperature monitoring devices is correct with a simple configuration. With the goal.

  The present invention relates to a plurality of assembled batteries having a plurality of cells connected in series, a voltage detector for obtaining cell voltage data of the plurality of cells, and a diagnostic signal circuit for generating an operation check signal for the voltage detector. Oscillates when a module, a plurality of operation check signal detectors for detecting the operation check signal of each assembled battery module, and the plurality of operation check signal detectors detect the corresponding operation check signals And an operation check signal determination device having an oscillator that stops the oscillation when any of the operation check signals is not detected, and a shutdown for stopping the operation of the plurality of assembled battery modules when the oscillation is stopped. A secondary battery device including a shutdown signal output unit that outputs a signal is provided.

  The present invention also provides a vehicle in which the secondary battery device is mounted as an energy storage unit that operates a drive system.

  By the above means, a highly reliable operation can be obtained.

It is a figure which shows the vehicle mounting example of the battery apparatus by one Example of this invention. It is a figure which shows the internal structural example of the assembled battery module of FIG. It is a figure which shows the basic structural example of the temperature detection apparatus in an assembled battery module. It is a figure which shows the basic structural example of the battery voltage detection part in a battery pack module, and an equalization process part. It is a figure which shows the structural example of the battery management apparatus (BMU) of FIG. It is a figure which shows the structural example of the electric power supply management apparatus in the battery management apparatus (BMU) of FIG. It is a figure which shows the structural example of the noise countermeasure function in the secondary battery apparatus which concerns on this invention. It is a figure which shows the example of a processing system of the signal for operation check (alert signal) in the secondary battery apparatus which concerns on this invention. It is a figure which shows the example of the shutdown signal path | route in the secondary battery apparatus which concerns on this invention. It is a figure which shows the structural example of the alert signal detection part of the processing system of the alert signal of FIG. It is a figure which shows the example of each part signal waveform of the alert signal detection part of FIG. It is a figure which shows the example of an internal structure of the logic circuit of the alert signal detection part of FIG. It is a figure which shows the example of each part signal waveform of the alert signal detection part of FIG. It is a timing diagram explaining the operation timing of the processing system of the noise countermeasure function and the alert signal described above.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 illustrates an example in which a battery device according to an embodiment of the present invention is mounted on a vehicle 100. However, FIG. 1 schematically shows the vehicle 100, the location where the battery device is mounted on the vehicle 100, the drive motor of the vehicle 100, and the like.

  In the battery device, a plurality of assembled battery modules 101 (1), 101 (2),... 101 (4) are connected in series. The assembled battery modules 101 (1), 101 (2),... 101 (4) can be detached independently and can be exchanged with other assembled battery modules.

  One terminal of the connection line 31 is connected to the negative terminal of the assembled battery module 101 (1) on the lower side of the battery device (the lower voltage is referred to as the lower side). The connection line 31 is connected to the negative input terminal of the inverter 40 via a current detection unit in the battery management device 60 described later. Further, one terminal of the connection line 32 is connected to the positive terminal of the assembled battery module 101 (4) on the upper side of the battery device (the higher voltage is referred to as the upper side) via the switch device 33. The other terminal of the connection line 32 is connected to the positive input terminal of the inverter 40. The switch device 33 includes a precharge switch that is turned on when the battery is charged and a main switch that is turned on when the battery output is supplied to the load.

  The inverter 40 converts the input DC voltage into a three-phase alternating current (AC) high voltage for driving the motor. The output voltage of the inverter 40 is controlled based on a control signal from an electric control device 71 for controlling a battery management device 60 or an entire vehicle operation described later. The three-phase output terminals of the inverter 40 are connected to the three-phase input terminals of the motor 45.

  The assembled battery modules 101 (1), 101 (2),... 101 (4) have assembled batteries 11, 12, 13, 14 and voltage / temperature monitoring devices 21, 22, 23, 14, respectively.

  The voltage / temperature monitoring devices 21 and 22 are connected to each other via a communication unit to enable bidirectional communication, and the voltage / temperature monitoring devices 23 and 24 are also connected to each other via a communication unit to enable bidirectional communication. It is. The information input / output terminal on the lower side of the voltage / temperature monitoring device 21 is connected to the voltage management device 60 via the connector 51. The information input / output terminal on the upper side of the voltage / temperature monitoring device 21 is connected to the information input / output terminal on the lower side of the voltage / temperature monitoring device 22. The information input / output terminal on the lower side of the voltage / temperature monitoring device 23 is connected to the voltage management device 60 via the connector 52. The upper information input / output terminal of the voltage / temperature monitoring device 23 is connected to the lower information input / output terminal of the voltage / temperature monitoring device 24.

  In the above example, the communication units of the voltage / temperature monitoring devices 21 and 22 are connected in series, and the communication paths of the voltage / temperature monitoring devices 23 and 24 are connected in series, but the respective voltage / temperature monitoring devices 21-24 are connected. May be connected to the voltage management device 60 independently.

  An independent voltage management device power supply 70 is connected to the voltage management device 60. A host control device 71 that manages the entire vehicle in response to an operation input from a driver or the like is also connected.

  FIG. 2 shows in detail the functional blocks of the voltage / temperature monitoring device 21-24. Since the functional blocks of the voltage / temperature monitoring device 21-24 are the same, the functional blocks will be described as a representative of the voltage / temperature monitoring device 21. The voltage / temperature monitoring device 21 includes a lower communication unit 211 connected to the connector 51 and a higher communication unit 212 connected to the voltage / temperature monitoring device 22. The voltage / temperature monitoring device 21 includes a voltage detection unit 214 and a temperature detection unit 214. The voltage / temperature monitoring device 21 includes an equalization processing unit 215 for equalizing the voltages of the cells. The voltage / temperature monitoring device 21 also includes a diagnostic signal circuit 216 that outputs the operating state of the voltage / temperature monitoring device 21.

  The voltage detection unit 214 detects a voltage between terminals of each cell of the assembled battery. The detected cell voltage is transferred to the voltage management unit 60 via the communication unit. The temperature detection unit 214 detects the temperature in the vicinity of each cell or a plurality of cells. The detected temperature data is transferred to the voltage management unit 60 via the communication unit.

  The equalization processing unit 215 is provided for the following reason. In an assembled battery device, it is known that energy between the combined cells becomes uneven due to charge / discharge of the secondary battery, temperature variation, and the like. When the energy between the cells becomes uneven, it becomes impossible to perform efficient charging and discharging so as to maximize the function as the battery device. If charging is performed in a state where a cell with a high remaining capacity exists without performing equalization processing, a cell with a low remaining capacity does not become fully charged, but a cell with a high remaining capacity quickly enters a fully charged state and complete charging is completed. Sometimes. Therefore, when performing charging, the equalization processing unit 215 needs to equalize energy between cells.

  The diagnostic signal circuit 216 outputs an operation check signal (for example, an alert signal is used here) indicating that the voltage / temperature monitoring device 21 is operating normally.

  This alert signal is independently transmitted to the battery management device 60 as a 16 KHz signal, for example, via a line independent of the transmission path of the communication unit. In the present invention, the alert signal is used as an operation check signal.

  The alert signal monitors whether the voltage / temperature monitoring device 21 normally measures the cell voltage. The voltage / temperature monitoring device 21 measures the cell voltage at a constant cycle based on the clock. The measurement value is transferred to the communication unit with a pulse having a constant period. At this time, when the measured value can be acquired, “1” is set when “0” cannot be acquired and “0” is set, and the pulse having the predetermined period (which may be referred to as a binarized signal) is generated in the diagnostic circuit. Use as a signal. When this alert signal is missing or stopped, the voltage / temperature monitoring device 21 can be used as a material for determining that the cell voltage is not normally measured.

  The voltage / temperature monitoring devices 21-24 are each provided with a control unit including a sequencer to control data transmission / reception and switch operation timing. In addition, the control unit obtains the sum of the voltages of the cells measured by the voltage detection unit 213 and transfers them to the battery management unit 60 via the communication unit. The alert signal can also be used for other purposes. For example, if one cell voltage is smaller than 3V, it is normally output, but if it exceeds 3V, it is stopped by the control unit as an alert signal indicating overcharge prevention, for example. The

  FIG. 3 shows a basic configuration example of the temperature detection device. The plurality of cells 11 (1) to 11 (x) connected in series constitute the assembled battery 11. The positive electrode terminal and the negative electrode terminal of each cell 11 (1) to 11 (x) are connected to the voltage detection unit 213. The voltage detector 13 individually measures the inter-terminal voltage between the positive terminal and the negative terminal of each cell. Further, temperature sensors T (a) to T (x) are arranged in the vicinity of the cells 11 (1) to 11 (x). The output terminals of the temperature sensors T (a) to T (x) are connected to the temperature detection unit 214. The temperature detection unit 214 converts the outputs of the temperature sensors T (a) to T (x) into data and outputs the data to the communication unit.

  FIG. 4 shows the equalization processing unit 215. The negative terminals and the positive terminals of the plurality of cells 11 (1) to 11 (x) are connected to the voltage detection unit 213 via the discharge resistors 21r (1) to 21r (x + 1), respectively.

  One terminal of the discharge resistors 21r (1) and 21r (2) is connected to the negative and positive terminals of the cell 11 (1), and the other terminal is connected to one and the other terminals of the discharge switch SW (1). ing. One terminal of the discharge resistors 21r (2) and 21r (3) is connected to the negative terminal and the positive electrode of the cell 11 (2), and the other terminal is connected to one and the other terminals of the discharge switch SW (2). ing. Similarly, the two sets of discharge resistors are connected to the negative and positive terminals of the corresponding cells, and the other terminal is connected to one and the other terminals of the corresponding discharge switch.

  Discharge resistors 21r (1) to 21r (x + 1) and discharge switches SW (1) to SW (x + 1) are included in equalization circuit 21A. The discharge switches SW (1) to SW (x + 1) are on / off controlled by the switch control circuit 21B.

  The voltage detection circuit 213 detects the voltage between the terminals of the cells 11 (1) to 11 (x). Each detected cell voltage is taken into the energy deviation calculation part 601 of the battery management part 60 via a communication part. Further, the current I flowing in the assembled battery 11 is also detected by the current detection circuit 602 and taken into the energy deviation calculation unit 601.

  When the energy deviation calculation unit 601 obtains the charge amount of each cell, the energy deviation unit 601 obtains the difference in charge amount between the cell with the smallest charge amount and each of the other cells. Using this difference, the discharge time conversion unit 603 obtains the discharge time of each cell in order to make the smallest charge amount and the charge amount of each cell the same. The discharge time data is set in the switch control unit 21B.

  The switch control unit 21B controls on / off of the discharge switches SW (1) to SW (x + 1) corresponding to the respective cells according to the discharge time data. For example, assuming that the cell 11 (1) is a discharge target, the switch SW (1) is turned on. As a result, the current from the cell 11 (1) flows through the resistor 21r (2) -21r (1) and is discharged. For example, if the cell 11 (x + 1) is a discharge target, the switches SW (x-1), SW (x-2), SW (x-3),... SW (1) are turned on. As a result, the current from the cell 11 (x + 1) flows through the resistor 21r (x + 1) -21r (1) and is discharged.

  The discharge time length required for energy equalization can be shortened by decreasing the resistance value of the discharge resistor and increasing the amount of current. However, if the amount of current is large, the amount of heat generation increases, which is not preferable for the apparatus. Therefore, a relatively large resistance value of the discharge resistor is selected and determined by a trade-off with a required equalization processing time (1 hour to several hours).

  In some cases, the discharge time may be obtained using not the charge amount but the ratio of the charge amount to the battery capacity, that is, the SOC.

  FIG. 5 shows an entire block of the battery management device 60 and will be described. The battery management device 60 and the assembled battery modules 101 (1) and 101 (3) are electrically connected via connectors 51 and 52. The connection lines between them include a bidirectional data line, a clock line, an alert signal line (which also functions as an operation check signal line in this apparatus), a power supply line, an earth line, and the like.

  The battery management device 60 includes interfaces 611 and 612 connected to the connectors 51 and 52. The voltage / temperature monitoring devices 21, 22, 23, and 24 output warning signals ALT1, ALT2, ALT3, and ALT4 indicating that they are operating. The respective alert signals ALT1, ALT2, ALT3, and ALT4 are Are input to an alert signal processor (ASP) 614 via connectors 51 and 52 and interfaces 611 and 612. The alert signal processor (ASP) 614 can determine whether each voltage / temperature monitoring device 21, 22, 23, 24 is operating normally by monitoring the alert signals ALT1, ALT2, ALT3, ALT3. it can. The alert signal processor 614 may be considered as an operation check signal determination device that processes an operation check signal described later.

  Further, between the interfaces 611 and 612 and the microprocessor (MPU) 614 for bidirectional communication between the battery management device 60 and the assembled battery modules 101 (1), 101 (2), 101 (3), and 101 (4). , Lines 621 and 622 are connected. As a communication standard performed through the lines 621 and 622, for example, a bidirectional serial communication standard is adopted.

  A line 623 connected between the microprocessor 615 and the interfaces 611 and 612 is a line for supplying a shutdown signal SHDN to each of the assembled battery modules 101 (1), 101 (2), 101 (3), and 101 (4). . The shutdown signal is output, for example, when the voltage / temperature monitoring devices 21, 22, 23, 24 are shut down by the logical operation of the microprocessor 615, or when the power supply voltage of the microprocessor 621 falls below a predetermined value. Is done. This shutdown signal SHDN is transmitted via a communication path including a communication unit.

  The microprocessor 615 is also connected to the current detection circuit 602 described above. Further, the voltage information of the negative terminal 61T of the battery device is input to the microprocessor 615 via the terminal 61IN, and the voltage information of the positive terminal 62T of the battery device is input via the terminal 62IN.

  Furthermore, lines 624 and 625 are connected between the microprocessor 615 and the alert signal processor 614. Thus, the alert signal of the microprocessor 615 is input to the alert signal processor 614 via the line 624 and monitored, and conversely, the alert signal of the alert signal processor 614 is input to the microprocessor 615 via the line 625. Be monitored. Accordingly, the microprocessor 615 and the alert signal processor 614 can monitor whether each other is operating normally.

  The power supply management device 616 supplies a power supply voltage to the interfaces 611 and 612 and the current detection circuit 602 via the power supply line 626. The power supply management device 616 supplies a power supply voltage (for example, 5 V) to the microprocessor 615 and the alert signal processor 614 via the power supply line 627.

  The power supply management apparatus 616 is supplied with a DC power supply voltage of 12 volts from the BMS power supply 70 via the connector 80. The power supply management device 616 has a DC-DC converter and converts a 12-volt power supply voltage into a 5-volt power supply voltage used by the alert signal processor 614 and the microprocessor 615.

  The power supply management device 616 has a function of maintaining the operation state and a function of repeating the non-operation state and the operation state according to the time set in the timer 617 periodically. In a normal vehicle driving state, an ON control signal from the microprocessor 615 is given to the power supply management device 616 via the line 628. However, for example, when the vehicle is stopped, it is preferable to stop power supply in order to reduce power consumption in the battery management device 60. However, on the other hand, in order to perform cell balance, so-called equalization processing, the battery management device 60 must be in an operating state. Therefore, the non-operation state and the operation state are periodically repeated according to the time set in the timer 617. The timer 617 receives a start signal from the microprocessor 615 through the line 631, performs pulse measurement for a predetermined time, and outputs a measurement end signal. Next, a transition is made again to the pulse measurement state for a fixed time, and this operation is repeated. The microprocessor 615 can monitor the operation state of the timer 617 and recognize the power supply state.

  The timer 617 is supplied with power from the power source 70 so as to always operate. Power is also supplied to the memory (EEPROM) 618 via the internal line of the timer 617. The memory (E2PROM) 618 stores software programs used by the microprocessor 615, data for parameters, and the like. Accordingly, the memory (E2PROM) 618 and the microprocessor 615 are connected via the line 632.

  When the microprocessor 615 detects that the ignition key for starting the vehicle and the device is attached or detached, it sends an ignition ignition control signal for turning on or off the ignition main switch via the line 633 to the driver 619. To supply. When the microprocessor 615 detects that the external charger is connected or disconnected, the microprocessor 615 supplies a charge switch control signal for turning on or off the charge switch to the driver 619 via the line 634.

  The driver 619 performs voltage-current conversion in response to the ignition ignition control signal and the charging switch control signal, and supplies the converted current to the driving coils 74 and 75 of the ignition main switch SW1 and the charging switch SW2.

  The driver 619 is also supplied with an alert signal from the alert signal processor 614. When the alert signal indicates a system abnormality, the driver 619 controls the ignition main switch SW1 and the charge switch SW2 to be in an off state in order to prevent circuit operation runaway and overcharge / overdischarge of the cell.

  The alert signal is also transmitted to the host control unit (ECU) 71 of the vehicle via the line 640 and the connector 81 when an abnormality occurs. Further, the positive polarity data and the negative polarity data of the microprocessor 615 are transmitted to the upper control unit (ECU) 71 via the lines 641 and 642 and the connector 81. The data contents include, for example, data that informs the remaining battery level and battery life, and data that informs the battery management state (equalization processing, sleeping). Data can also be transmitted from the microprocessor 615 to the host control unit (ECU) 71 via the line 643 for debugging. Furthermore, a line 644 is a line for giving a command such as a data request to the microprocessor 615 from the host control unit (ECU) 71. Line 645 is an earth line.

  FIG. 6 shows the inside of the power supply management device 616. Power from the power source 70 is supplied to the switch 6100 of the power management apparatus 616. This switch 6100 is ON / OFF controlled by the output of the OR circuit 6101. The output of the switch 6100 is input to the DC-DC converter 6111 and subjected to voltage conversion. The converted voltage is supplied to the interfaces 611 and 612, the alert signal processor 614, the microprocessor 615, and the like described above.

  A switch on / off control signal from the microprocessor 615 is input to the OR circuit 6101 via the line 6102. The OR circuit 6101 receives an ignition key detection signal indicating that the ignition key has been attached or detached via the line 6103. An external charger detection signal indicating that the external charger is connected or disconnected is input via the line 6104. Further, for example, a count end pulse of the timer 617 is input via the line 6105.

  With the above configuration, the switch 6100 maintains the on state if the on / off control signal from the microprocessor 615 is always at a high level. Further, the ON state is maintained even when the ignition switch detection signal is always at a high level. Even if the external charger detection signal is constantly at a high level, the ON state is maintained.

  Assume that lines 6102, 6103, and 6104 are at a low level. Assume that the timer 617 is activated. Then, the timer output becomes high level in a fixed time cycle. For this purpose, the switch 6100 can be turned on in a fixed time cycle. On the other hand, the operating state of the battery management device 60 can be obtained periodically in order to execute the equalization process while reducing the power.

  FIG. 7 shows an extracted characteristic portion of the secondary battery device according to the present invention. The sum data of each cell voltage data measured by each voltage detector 213 in each voltage / temperature monitoring device 21, 22 and each cell voltage data obtained by each adder 213 a is sent to the communication unit 211 and the connector 51. Via the interface 611. Further, the sum data of the cell voltage data measured by the voltage detectors 213 in the voltage / temperature monitoring devices 23 and 24 and the cell voltage data obtained by the adders 213a are the communication unit 211 and the connector 52. To the interface 612. In consideration of safety, the communication unit 211 includes a DC blocking unit for separating the ground level between the voltage / temperature monitoring device (between assembled battery modules) and between the voltage / temperature monitoring device and the battery management device. . For example, a coil coupling circuit composed of a primary side coil and a secondary side coil, or a photo coupling circuit using a light emitting element and a light receiving element is employed as the direct current blocking unit.

  Each cell voltage data V (1), V (2),... V (x) input to the interface 611 via the connector 51, and total data MVALL (referred to as transmission-side total data) of each cell voltage data. ) Is temporarily input to the buffer 6311 of the macro processor 615 via the communication unit 6212 provided in the interface 611. Here, the sum data MVALL of each cell voltage data is data obtained by summing up the voltage data of each cell constituting the assembled battery.

  Each cell voltage data input to the interface 612 via the connector 52 and the total data of each cell voltage data are temporarily stored in the buffer 6311 of the macro processor 615 via the communication unit 6214 provided in the interface 612. input.

  Next, the cell voltage data and the total data obtained by the respective voltage / temperature monitoring devices 21, 22, 23, and 24 are input to the cell voltage data acquisition unit 6312 and the total data acquisition unit 6313, respectively.

  Next, the sum total data calculation unit 6314 sums the cell voltage data V (1), V (2),... V (x) from the voltage / temperature monitoring device 21 input to the cell voltage data acquisition unit 6312. Data SVALL (referred to as reception side total data) is obtained. The reception side summation data SVALL and the transmission side summation data MVALL are input to the coincidence determination unit 6315 to determine whether or not they match. If the two match, it means that data transmission has been performed normally, and a coincidence determination signal is sent to the normality reporting unit 6316. Thus, each cell voltage data is used for various calculations and determinations (for example, energy deviation calculation described above).

  If the reception-side total data and the transmission-side total data do not match, a determination signal is given from the match determination unit 6315 to the re-read command unit 6317. Then, the re-read command unit 6317 outputs a read command of each cell voltage data of the voltage / temperature monitoring device 21 and its sum data. The read command is sent to the voltage / temperature monitoring device 21 via the communication unit. In response to the read command, the voltage / temperature monitoring device 21 outputs each cell voltage data and its sum data again.

  The voltage detection unit 213 and the addition unit 213a have buffers, and maintain the previous cell voltage data and the total data of the cell voltage data until the next measurement is performed. Therefore, in response to the read command from the re-read command unit 6317, each cell voltage data and the sum data of each cell voltage data can be transmitted again. When the retransmitted cell voltage data and the total data are sent to the macro processor 615, the microprocessor 615 compares the reception side total data and the transmission side total data again. If the two match at this time, it means that data transmission has been performed normally, and a coincidence determination signal is sent to the normality reporting unit 6316. However, if the two do not match, the re-read command unit 6317 again outputs a read command for each cell voltage data of the voltage / temperature monitoring device 21 and its sum data.

  Here, data on the number of times of re-reading is monitored in the stop command unit 6318. When the number of rereads reaches a predetermined number (for example, 5 times) continuously, the stop command unit 6318 determines that there is a problem with the transmission system or the measurement system, and issues a reread stop command for canceling the reread. Output. In response to the stop command, the microprocessor 615 outputs a warning signal to the host control unit 71 and supplies a shutdown signal to the voltage / temperature monitoring device 21-24 via the communication unit.

  In the above description, an example has been described in which it is determined whether or not each cell voltage data of the voltage / temperature monitoring device 21 and its sum data are correctly transmitted to the microprocessor 615. Similarly, it is determined whether or not each cell voltage data of the other voltage / temperature monitoring devices 22, 23, and 24 and their total data are correctly transmitted to the microprocessor 615. For this reason, it is possible to separately obtain the coincidence / non-coincidence determination outputs of the reception-side total data SVALL and the transmission-side total data MVALL for the voltage / temperature monitoring devices 21, 22, 23, and 24. Therefore, when a mismatch output is obtained, it can be determined for which voltage / temperature monitoring device the mismatch output is obtained. The determination result is managed as history information by the microprocessor 615 and transferred to the host control unit 71 in response to a request.

  Thereby, in the microprocessor 615, data acquisition is performed correctly and the operation reliability of the apparatus can be obtained. In addition, data acquisition is less susceptible to noise, and the accuracy of data acquisition can be improved.

  In addition, although described so that the addition part 213a may be included in the inside of the voltage detection part 213, both may be provided independently. The control unit in the voltage / temperature monitoring device 22 may also serve as the addition unit.

  FIG. 8 shows an alert signal processing system and the like. The voltage / temperature monitoring devices 21, 22, 23, and 24 generate alert signals, respectively. The alert signal is generated, for example, as a 16 Hz pulse signal by branching the operation clock output from the oscillator by the diagnostic signal circuit 216. A control unit is provided in, for example, the voltage detection unit 213 or the equalization processing unit 215 in the voltage / temperature monitoring devices 21, 22, 23, and 24, and the control unit generates the operation clock.

  Alert signals ALT 1 and ALT 2 from the voltage / temperature monitoring devices 21 and 22 are input to the alert signal processor 614 via the connector 51 and the interface 611. The alert signals ALT3 and ALT4 from the voltage / temperature monitoring devices 23 and 24 are input to the alert signal processor 614 via the connector 521 and the interface 612. The alert signals ALT1-ALT4 are input to the alert signal processor 614 through a path independent of the previous communication path.

  The alert signal processor 614 is provided with alert signal detectors 6411, 6412, 6413, 6414 corresponding to the alert signals ALT1-ALT4. The alert signal detection unit 6420 detects the alert signal ALT5 from the multiprocessor 615. In the present invention, the alert signal detection unit is named, but it may be referred to as an operation check signal detection unit.

  Each of the alert signal detection units 6411, 6412, 6413, 6414, and 6420 can obtain a high level output when a 16 Hz alert signal is normally input, and each high level output is input to an AND circuit 6415. Is done. The AND circuit 6415 obtains a high level output when all inputs are at a high level, and supplies the high level output to the timer 6416. The timer 6416 outputs a high level output as long as the output of the AND circuit 6415 is at a high level, and continues the oscillation of the 10 Hz oscillator 6417. However, the timer 6416 can output a low level that stops the oscillation of the 10 Hz oscillator 6417 when the output of the AND circuit 6415 becomes a low level and continues for, for example, 0.5 seconds or more.

  Thereby, when the alert signal becomes abnormal, the oscillation of the 10 Hz oscillator 6417 is stopped, and this information is transmitted to the microprocessor 615 as abnormality occurrence information. When the microprocessor 615 recognizes the abnormality occurrence information, it outputs a system shutdown signal. The shutdown signal is input to the interfaces 611 and 612 via the line 623 shown in FIG. Flip-flop circuits are provided in the interfaces 611 and 612. The output is inverted by the shutdown signal, and an output for turning off the assembled battery module is obtained. Further, as shown in FIG. 5, an alert signal is transmitted to the upper control unit 71 as abnormality occurrence information.

  FIG. 9 illustrates the path of the shutdown signal in the interface 611 by taking it out. A flip-flop circuit 6111 that transfers a shutdown signal is provided in the interface 611. The Q output terminal of the flip-flop circuit 6111 is connected to the shutdown control terminal of the voltage / temperature monitoring device 21 via the connector 51. A shutdown cancellation signal is input to the set input terminal S of the flip-flop circuit 6111 via the signal I / F circuit 6116. The signal I / F circuit 6116 is an insulation circuit, and for example, a temporary coil and a secondary coil are electromagnetically coupled to transmit a signal. This shutdown cancellation signal is output from the microprocessor 615. When the shutdown cancellation signal is input, the signal I / F circuit 6116 outputs a pulse and sets the flip-flop circuit 6111.

  A shutdown signal is input to the reset input terminal R of the flip-flop circuit 6111 through the photocoupler 6117.

  The output of the mono-multi circuit 6115 is connected to the input terminal of the photocoupler 6117. The output of the power supply voltage drop detection circuit 6116 is supplied to one input terminal of the mono-multi circuit 6115. The power supply voltage drop detection circuit 6116 detects whether the 12V voltage of the power supply from the power supply management device 616 has dropped. When the power supply voltage falls below a preset level, the output changes to low level, and the mono-multi circuit 6115 outputs a pulse in response to the falling edge of the set terminal. As a result, a reset pulse is supplied from the photocoupler 6117 to the flip-flop circuit 6111, the Q output of the flip-flop circuit 6111 becomes low level, and the voltage / temperature monitoring device 21 is shut down. When a pulse is to be obtained from the mono-multi circuit 6115, a shutdown signal can be given from the microprocessor 615 to the reset terminal.

  The mono-multi circuit 6115 is always supplied with a power supply voltage via a terminal 6118, a diode 6119, and a resistor 6112. The resistor 6112 and the capacitor 6113 form a smoothing filter.

  Further, the microprocessor 615 transmits abnormality occurrence information to the upper control unit 71 via, for example, the data line 643.

  The shutdown signal output unit 6630 may be provided in the microprocessor 615 or in the alert signal processor 614.

  The power supply terminal of the flip-flop circuit 6111 is supplied with power from the voltage / temperature monitoring device 21 via the connector 51 and the diode 6112, and the power supply from the power supply management device 616 is also the power I / F circuit 6114, It is supplied via a diode 6113. Therefore, the flip-flop circuit 6111 has two power supply paths and can operate even when one of the power supplies is turned off. The power supply I / F circuit 6114 is also a transformer circuit having a primary side coil and a secondary side coil.

  FIG. 10 shows alert signal detection units 6411, 6412, 6413, 6414, 6420, an AND circuit 6415, a timer 6416, and a 10 Hz oscillator 6417. In particular, the inside of the alert signal detection unit 6411 is representatively shown and described in detail. FIG. 11 shows signal waveforms of the respective parts.

  The alert signal ALT1 which is a pulse of 16 Hz is input to the edge detection unit 6514 as a signal A11 (also shown in FIG. 11) and sampled as an inverted alert signal A12 (also shown in FIG. 11) via an inverter 6501. Input to the circuit 6511. The alert signal A11 is input to the sample circuit 6512. The sample circuits 6511 and 6512 sample the input alert signals A11 and A12 with a 400 Hz clock A13 (also shown in FIG. 11). If the alert signals A11 and A12 are normal, a positive sample signal can always be obtained by combining the outputs of either one of the sample circuits 6511 and 6512. This is because a positive sample signal is output from the sample circuit 6512 when the alert signal A11 is positive, and a positive sample signal is output from the sample circuit 6511 when the alert signal A11 is negative.

  The outputs of the sample circuits 6511 and 6512 are input to the logic circuit 6513, the state of the sample signal is monitored, and a determination output as to whether the alert signal A11 is normal or abnormal is obtained.

  FIG. 12 illustrates a configuration example of the logic circuit 6513 described above. FIG. 13 shows signal waveforms at various parts. Since the output of the sample circuit 6511 and the output of the sample circuit 6512 are processed by a circuit having the same configuration, the processing circuit of the output of the sample circuit 6511 is shown in detail, and the processing circuit of the output of the sample circuit 6512 is shown as a block 6620. .

  The output of the sample circuit 6511 is input to the counter 6611 and also input to the counter 6612 through the inverter 6613. The counters 6611 and 6612 are reset by the edge detection pulse A14 from the edge detection unit 6514. For example, the edge detection pulse detects a falling edge of a 16 Hz alert signal and outputs a pulse.

  The count outputs of the counters 6611 and 6612 are input to the comparator 6614 and the comparator 6614. The comparator 6614 outputs a high level “H” when the count output of the counter 6611 indicates 20 or more, and outputs a low level “L” when the count output is less than 20. The comparator 6614 outputs a high level “H” when the count output of the counter 6612 indicates 5 or less, and outputs a low level “L” when it exceeds 5.

  When the count output of the counter 6611 is 20 or more and the count output of the counter 6612 is 5 or less, the signal A11 is almost close to a 16 Hz pulse. However, when the count output is less than 20 and the count output of the counter 6612 is 5 or more, there is no signal A11 or the waveform is disturbed. At this time, a low level is output from the AND circuit 6616.

  An operation similar to the above is performed in block 6620. Therefore, the output of the AND circuit 616 and the output of the similar AND circuit in the block 6620 are input to the AND circuit 6617, and the output of the AND circuit 6617 is used as the output of the alert signal detection unit 6411.

  Here, if the comparison value 20 and the value 5 set in the comparator 6614 and the comparator 6614 are changed, the judgment can be made stricter or relaxed. For example, if the comparison value 18 and the value 7 are changed, normal detection can be obtained even if noise is mixed in the alert signal and the waveform is disturbed to some extent.

  For example, the ignition switch detection signal B11 is used to check whether the above-described acquisition of the cell voltage data is correctly performed and whether a normal alert signal is obtained from each of the voltage / temperature monitoring devices 21-24. When obtained, the microprocessor 615 is activated. FIG. 14 shows an example of processing after the ignition switch detection signal B11 is obtained. This is to check various signal states before the vehicle is driven to prevent an accident from occurring. When the ignition switch detection signal B11 is obtained, the cell voltage data described with reference to FIG. 10 is checked in the subsequent period T1. At the same time, it is checked whether or not the alert signals ALT1 to ALT5 described with reference to FIGS. In the next period T2, the check result is output. When the apparatus is operating normally, a permission signal B12 that permits the entire operation is obtained, and when it is abnormal, a shutdown signal is obtained. The permission signal B12 is transmitted to the host control device 71. When receiving the permission signal B12, the host controller 71 receives an operation signal for driving the vehicle.

  As described above, according to the present invention, a function for determining the accuracy of measurement data transmitted from a monitoring device that measures voltage, temperature, etc. to the battery management device is provided, and safe battery management can be performed. In addition, it is possible to check whether cell voltage data transmitted from a plurality of voltage / temperature monitoring devices is correct with a simple configuration. For this reason, a situation in which inaccurate data is read by mistake is prevented.

  In the present invention, the above-described embodiment is an example, and the present invention is not limited to this configuration, and various modifications are possible.

  DESCRIPTION OF SYMBOLS 100 ... Vehicle, 101 (1) -101 (4) ... Assembly battery module, 11-14 ... Assembly battery, 21-24 ... Voltage / temperature monitoring apparatus, 40 ...... Inverter, 45 ... Motor, 51, 52, 80, 81 ... Connector, 60 ... Voltage management device, 70 ... Power supply for voltage management device, 71 ... High-order control device, 211, 6212 ... Communication unit, 213 ... Voltage detection unit, 213a ... Addition unit, 216 ... Diagnostic circuit, 602 ... Current detection circuit, 611, 612 ... Interface, 614 ... Alert signal processor, 615 ... Microprocessor, 616 ... Power supply management device, 617 ... Timer, 618 ... Memory, 619 ... Driver, 6312 ... Cell voltage data acquisition unit, 6313 ... Summation data Data acquisition unit, 6314 ... total data calculation unit, 6315 ... coincidence determination unit, 6314 ... normal report unit, 6317 ... re-read command unit, 6318 ... stop command unit, 6411-6414, 6420 ... Alert signal detection unit, 6415 ... AND circuit, 6416 ... Timer, 6417 ... 10Hz oscillation unit.

Claims (6)

A plurality of cells connected in series, a voltage detection unit that obtains each cell voltage data of the plurality of cells, and the voltage detection unit are outputs with a fixed period when operating normally, and the fixed period is disturbed when operating abnormally A plurality of assembled battery modules having a diagnostic signal circuit for generating an operation check signal to be in a state;
A plurality of operation check signal detection units for detecting the operation check signals of each assembled battery module and the plurality of operation check signal detection units oscillate when detecting the corresponding operation check signals, respectively, An operation check signal determination device having an oscillator that stops the oscillation when no operation check signal is detected;
And a shutdown signal output unit that outputs a shutdown signal for stopping operation to the plurality of assembled battery modules when the oscillation is stopped. A microprocessor for processing each cell voltage data from each assembled battery module and calculating a remaining capacity of each cell;
The secondary battery device according to claim 1, wherein the plurality of operation check signal detection units include a detection unit that detects an operation check signal from the microprocessor.   2. The secondary battery device according to claim 1, wherein the operation check signal determination device supplies an internal operation check signal to the microprocessor for monitoring.   The detection of the operation check signal by a plurality of alert signal detection units is executed when an ignition switch for activating a device equipped with the assembled battery module is detected. Secondary battery device. The plurality of operation check signal detection units,
A sample circuit that samples the operation check signal at a frequency that is ten times the frequency of the operation check signal;
First and second counters for counting the number of high level samples and the number of low level samples of the sample output logic from the sample circuit, respectively
A comparator that compares the number of high-level samples with a first value at a fixed period and compares the number of low-level samples with a second value;
Only when the output of the comparator has the number of high level samples larger than the first value and the number of low level samples smaller than the second value, the judgment output indicating that the operation check signal indicates the normality of the apparatus. The secondary battery device according to claim 1, further comprising a logic circuit to be obtained. A vehicle comprising the secondary battery according to any one of claims 1 to 5.

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